Dial control device

ABSTRACT

The present invention aims to provide a dial control device having a maneuverability of a control knob improved by making this in cylindrical shape and downsized by disposing another control knob installed within the first-mentioned cylindrical control knob. A dial control device comprising: a cylindrical control knob, a sun gear rotating integrally with said control knob for transmission of a driving force from said control knob, a planet gear interlocking with said sun gear, an internal gear cooperating with said sun gear to guide said planet gear in a direction of its movement, and a control cable coupled to said planet gear so as to operate an external device, wherein said driving force generated by rotational operation of said control knob is transmitted via said sun gear, said planet gear and said control cable to the external device to control operation of said external device.

BACKGROUND OF THE INVENTION

Dial control device functioning to transmit driving force generated byrotary operation of a control knob to an external device via a controlcable and thereby to control operation of the external device.

BACKGROUND ART

While various types of dial control device have already been proposed,the dial control device for air conditioning unit of a motor vehicle ofprior art will be discussed hereunder.

FIGS. 42 and 43 of the accompanying drawings illustrate the controldevice for air conditioning unit of a motor vehicle disclosed inJapanese Laid-Open Patent Application Gazette No. 2003-267034 whereinFIG. 42 is a front view of this device and FIG. 43 is a plan viewthereof.

As will be apparent from FIGS. 42 and 43, a control knob 11 for winddirection regulation, a control knob 12 for airflow regulation and acontrol knob 13 for temperature regulation, each implemented in the formof so-called dial control knobs, are rotatably mounted on a controlpanel 10. This control panel 10 is additionally provided with a manualoperation button 14 for rear defroster switch adapted to energize hotwire in the rear window, a manual operation button 15 for airconditioning switch for exchange of air conditioning mode, and a manualoperation button 16 for exchange of indoor air circulation/outdoor airintake.

The control panel 10 is mounted on a housing 17 a provided on a frontside of a base 17 and a portion of the base 17 horizontally extendingrearward from the housing 17 a is provided with bearings 19, 25 adaptedto support respective gear shafts 18, 24 of said control knobs 11, 13 ina rotatable manner.

Specifically, the control knob 11 is supported at one end of its gearshaft 18 which is, in turn, provided with a bevel gear 18 a and theother end of the gear shaft 18 is supported by the bearing 19 mounted onthe base 17.

The bevel gear 18 a is engaged with a gear 20 a of a gear lever 20 sothat rotation of the control knob 11 may be transmitted to the gearlever 20.

The bevel gear 18 a is engaged with a gear 20 a of a gear lever 20 sothat rotation of the control knob 11 may be transmitted to the gearlever 20.

The gear lever 20 is rotatably supported by a cylindrical bearing 21formed on the base 17 and a control cable 22 for operation control ofthe air conditioning unit (not shown) is connected to an arm 20 b ofthis gear lever 20.

In this way, rotational operation of the control knob 11 causes the gearlever 20 to be rotated in association with the bevel gear 18 a so thatan inner cable 22 a of the control cable 22 is advanced or retracted soas to achieve wind direction regulation in the air conditioning unit.

The control cable 22 consists of an outer cable 22 b and an inner cable22 a slidably contained in the outer cable 22 b. The outer cable 22 b isfixed at its one end to a clamp member 23 mounted on the base 17.

In a similar manner, the control knob 13 is supported at one end of itsgear shaft 24 and the other end of the gear shaft 24 is supported by thebearing 25 mounted on the base 17. A bevel gear 24 a mounted on thisgear shaft 24 is engaged with a gear 27 a of a gear lever 27 supportedby a bearing 26. The control cable 28 is connected to an arm 27 n of thegear lever 27.

In this way, the inner cable 28 a of the control cable 28 is advanced orretracted as the control knob 13 is rotationally operated so as toachieve temperature regulation in the air conditioning unit.

The control cable 28 consists of, like the control cable 22, an innercable 28 a and an outer cable 28 b wherein one end of the outer cable 28b is fixed to a clamp member 29 mounted on the base 17.

The control knobs 11, 12, 13 are provided with so-called operationalfeel giving mechanism adapted to stop rotation of the control knobtemporarily at a desired step of rotation.

FIG. 44 is scale-enlarged partial sectional view taken along a line A-Ain FIG. 42. As will be apparent from FIG. 42, a diameter-enlarged disc18 b provided on the gear shaft 18 is formed with an elongate pit 18 cextending orthogonally to the rotational axis of the shaft and a smallball 31 is put in this pit 18 c under biasing effect of a spring 30.

The base portion 17 b rotatably supporting said diameter-enlarged disc18 b is formed with depressions adapted to receive said small ball 31 sothat these depressions 32 cooperate with said small ball 31 to form theoperational feel giving mechanism.

More specifically, the depressions 32 are formed in the base portion 17b surrounding the diameter-enlarged disc so as to correspond to symbols(See FIG. 42) 33 a, 33 b, 33 c, 33 d, 33 e with which the indicator ofthe control knob is to be aligned.

When the control knob 11 is rotationally operated in order to align theindicator with the desired symbol, the small ball 31 is received in thedepression corresponding to this desired symbol and a slight brakingforce (operational feel) is exerted on the rotational operation of thecontrol knob 11.

The control knob may be rotated with an operating force overcoming suchbraking force to remove the small ball 31 from the depression and toenable the control knob to be rotated to the next depression.

The control knobs 12, 13 are also provided with the similar operationalfeel giving mechanism.

The control device as has been described hereinabove is designed so thata finger-grip projecting from the front surface of the control knob isheld with the fingers to operate the knob. Consequentially, it has beendifficult to transmit an operating force to the device and, with respectto maneuverability also, there has been a problem left behind.

To solve this problem, a control device having a cylindrical controlknob has been proposed and disclosed, for example, by Japanese Laid-OpenPatent Application Gazette No. 2004-210019.

FIG. 45 is a sectional view showing the control device of this type.

In this control device of prior art, a control knob for wind directionregulation, a control knob for airflow regulation and a control knob fortemperature regulation are implemented in cylindrical control knobs androtatably mounted on the control panel. In addition, respective buttonsfor a rear defroster switch, an air conditioning switch and an indoorair circulation/outdoor air intake exchanging switch are mounted on thecontrol panel.

The sectional view illustrates the control knob 41 for wind directionregulation and a drive force transmitting system thereof.

As illustrated, the control panel 40 is provided with the control knob41 in a rotatable manner and this control knob 41 is integrally providedon its outer periphery with a cylindrical interlocking gear 42.

A pair of interlocking gears 44, 45 mounted on shafts 43 b, 43 cprojecting forward from a front 43 a of the base 43 are engaged with aninternal gear 42 a of the interlocking gear 42 and these interlockinggears 44, 45 are engaged with an output gear 46.

The output gear 46 is integrally coupled to a gear shaft 47 and rotationof this output gear 46 drives a bevel gear 47 a and swings a gear lever48.

Specifically, rotational operation of the control knob 41 causes thegear lever 48 to be swung via the interlocking gear 42, the associatedgears 44, 45, the output gear 46 and the bevel gear 47 a and, inresponse to this, the inner cable of the control cable is advanced orretracted to achieve wind direction regulation in the air conditioningunit.

The control knob 41 contains therein a display member 50 adapted to belighted by a bulb 49.

The control device of this type is generally provided with theoperational feel giving mechanism as has been described above. Thismechanism consists of a spring-biased small ball contained in theelongate pit formed in the outer periphery of the interlocking gear 42rotating integrally with the control knob 41, said elongate pitextending in a direction orthogonal to the rotational axis of theinterlocking gear 42, on one hand, and a plurality of depressions formedon the base 43 so as to correspond to the symbols toward which thecontrol knob 41 is rotated.

The other control knobs are also provided with such operational feelgiving mechanism.

The above cited control device is accompanied with problems as will bedescribed below.

In the case of the control device adopting the control knob having aprojecting finger-grip as illustrated by FIGS. 42, 43, if it is tried tomount a operating switch in the center of the control knob or to makethe control knob in a ring-shape while a gear ratio between the bevelgear and the gear lever, an outer diameter of the bevel gear shaft willbe enlarged in proportion to the size of the control knob and, inconsequence, a diameter of the gear lever also will be enlarged.

In the case of the control device adopting the cylindrical control knobas illustrated by FIG. 45, the gear ratio is adjusted by providing thecontrol knob with the interlocking gear serving as the sun gear andproviding the output gear between the planet gear engaged with saidinterlocking gear and the gear lever. However, such countermeasureeventually leads to a reduction gear structure using many gears andinevitably complicates the construction as a whole.

In the recent motor vehicles, the number of devices such as operatingswitches and navigation devices increases day by day and the spaceavailable for the control device for air conditioning is correspondinglylimited. In such situation, the conventional layout of the controldevice characterized by arranging three control knobs in a transversedirection can not more adapt the trend of the times.

The respective actuating parts have been scattered on the control paneland therefore it has been difficult to operate these parts by touch. Inconsequence, the maneuverability in the course of driving a motorvehicle has been relatively poor.

The control device provided with the cylindrical control knob isadvantageous so far as handling of the control knob is concerned becauseof the operational feel giving mechanism consisting of the small ballprovided on the side of the interlocking gear and the depressions formedon the base. However, the control device of prior art has beeninevitably accompanied by the problem of backlash occurring between theinterlocking gear 42 and the associated gears 44, 45, between theseassociated gears 44, 46 and the output gear 46, and/or between the bevelgear 47 a and the gear lever 48. Such backlash may often lead to astroke loss of the control cable and/or histeresis phenomenon. Sometimesit has been impossible to obtain a predetermined cable stroke.

Furthermore, if a diameter of the cylindrical control knob is enlarged,the interval of the operational feel giving means will becorrespondingly enlarged, leading to the problem such that rotation ofthe control knob will be stopped at an intermediate position betweeneach of the adjacent proper positions defined by the operational feelgiving means and it will become difficult to align the indicator of thecontrol knob with the desired symbol.

In view of the problem as has been described above, it is a principalobject of the present invention to provide a dial control device havinga cylindrical control knob and adapted to minimize an affection of abacklash possibly occurring between each pair of gears, in additionthereto, adapted for simplification as well as downsizing withoutdeteriorating a desired maneuverability.

SUMMARY OF THE INVENTION

To achieve the object set fort above, the present invention proposes, ona first aspect, a dial control device comprising a cylindrical controlknob, a sun gear rotating integrally with said control knob fortransmission of a driving force from said control knob, a planet gearinterlocking with said sun gear, an internal gear cooperating with saidsun gear to guide said planet gear in a direction of its movement, and acontrol cable coupled to said planet gear so as to operate an externaldevice, wherein said driving force generated by rotational operation ofsaid control knob is transmitted via said sun gear, said planet gear andsaid control cable to the external device to control operation of saidexternal device.

On a second aspect, the present invention proposes one preferredembodiment of the control device wherein said cylindrical control knobincludes therein an operating switch adapted to perform an operationalcontrol independent from the operational control performed by saidcontrol cable.

On a third aspect, the present invention proposes another preferredembodiment of the control device comprising a base member rotatablysupporting said control knob, a control cable having an outer cableslidably containing therein an inner cable, and a clamp member mountedon said base member and adapted to fix one end of said outer cable at apredetermined position, wherein said inner cable is connected to saidplanet gear at an eccentric location spaced from a rotational center ofsaid planet gear and said clamp member is placed on an extension of aline connecting a pair of opposite ends of movement locus of saideccentric location within a rotatable range of said control knob.

On a fourth aspect, the present invention proposes another preferredembodiment of the control device comprising a base member rotatablysupporting said control knob, a control cable having an outer cableslidably containing therein an inner cable, a clamp member mounted onsaid base member and adapted to fix one end of said outer cable at apredetermined position, an interlocking gear in the form of a bevel gearmounted around an outer periphery of said cylindrical control knob, aplanet gear in the form of a spur gear and rotatably mounted on saidbase member, a sun gear including a bevel gear engaging saidinterlocking gear and a spur gear engaging said planet gear androtatably supported by said base member, and an internal gearcooperating with said sun gear to guide said planet gear in a directionof its movement.

On a fifth aspect, the present invention proposes another preferredembodiment of the control device comprising a cylindrical control knob,a sun gear rotating in association with rotational operation of saidcontrol knob and transmitting a driving force from said control knob, aplanet gear moving in association with said sun gear on a planar portionof a base member rotatably supporting said control knob and said sungear, and a cable holder for a control cable coupled to said planet gearto control operation of an external device, wherein said planar portionof the base member is formed with an elongate notch and said planet gearis provided with a projecting connector adapted to be movably insertedinto said notch and connected to said control cable behind said planarportion.

On a sixth aspect, the present invention proposes another preferredembodiment of the control device wherein said planar portion of the basemember is formed with an elongate square U-shaped notch and said planetgear is provided with a projecting connector adapted to be movablyinserted into said square U-shaped notch and connected to said controlcable within said square U-shaped notch.

On a seventh aspect, the present invention proposes another preferredembodiment of the control device wherein said cylindrical control knobincludes therein an operating member adapted to perform an operationalcontrol independent from the operational control performed by saidcontrol cable.

On an eighth aspect, the present invention proposes another preferredembodiment of the control device wherein: said control cable comprisesan outer cable slidably containing therein an inner cable, said basemember is provided with a cable holder adapted to fix one end of saidouter cable, said planet gear is provided at an eccentric locationspaced from its rotational center with a cable holder, said clamp memberis placed on an extension of a line connecting a pair of opposite endsof movement locus of said eccentric location within a rotatable range ofsaid control knob.

On a ninth aspect, the present invention proposes another preferredembodiment of the control device comprising: an interlocking gear in theform of a bevel gear mounted on an outer periphery of a cylindricalcontrol knob, a planet gear formed by a spur gear and movably disposedon said base member, and a sun gear integrally consisting of a bevelgear adapted to engage with said interlocking gear and a spur gearhaving a diameter smaller than a diameter of said bevel gear and adaptedto engage with said planet gear, said sun gear being rotatably supportedby said base member with said spur gear placed aside toward the basemember.

On a tenth aspect, the present invention proposes another preferredembodiment of the control device comprising: a cylindrical control knob,a sun gear in association with rotational operation of said control knoband serving for transmission of a driving force from said control knob,a planet gear moving in association with said sun gear on a planarportion of a base member rotatably supporting said control knob and saidsun gear, and a cable holder for a control cable coupled to said planetgear to control operation of an external device, wherein a gear caseprovided with an internal gear cooperating with said sun gear to guidesaid planet gear in a direction of its movement is fixed to said basemember, and wherein a driving force generated as said control knob isrotationally operated is transmitted via said sun gear, planet gear andcontrol cable to an external device and thereby operation of theexternal device is controlled.

On an eleventh aspect, the present invention proposes another preferredembodiment of the control device comprising: an interlocking gearcomprising a bevel gear mounted on an outer periphery of a cylindricalcontrol knob, a planet gear comprising a spur gear and movably providedon said base member, and a sun gear consisting of a bevel gear adaptedto engage with said interlocking gear and a spur gear adapted to engagewith said planet gear and rotatably supported by said base member andsaid gear case.

On a twelfth aspect, the present invention proposes another preferredembodiment of the control device comprising: a cylindrical control knob,an interlocking gear in the form of a bevel gear integrally mounted on aouter periphery of said control knob, a sun gear adapted to engage withsaid interlocking gear and serving for transmission of a driving forcefrom said control knob, a base member rotatably supporting said controlknob, said interlocking gear and said sun gear is provided with a planetgear adapted to move in association with said sun gear, said base memberis provided with an internal gear cooperating with said sun gear toguide said planet gear in the direction of its movement and with acontrol cable associated with said planet gear to operate an externaldevice, and said planet gear is provided with an operational feel givingmember adapted to be pressed against an operational feel giving memberprovided on said base member.

On a thirteenth aspect, the present invention proposes another preferredembodiment of the control device comprising: a cylindrical control knob,an interlocking gear in the form of a bevel gear integrally mounted on aouter periphery of said control knob, a sun gear adapted to engage withsaid interlocking gear and serving for transmission of a driving forcefrom said control knob, a base member rotatably supporting said controlknob, said interlocking gear and said sun gear is provided with a planetgear adapted to move in association with said sun gear, said base memberis provided with an internal gear cooperating with said sun gear toguide said planet gear in the direction of its movement and with acontrol cable associated with said planet gear to operate an externaldevice, said planar portion of the base member is formed with anelongate square U-shape notch and said planet gear is provided with aprojecting connector adapted to be movably inserted into said squareU-shape notch and to connect said control cable within said squareU-shape notch to said planet gear, and said square U-shape notch isformed on its bottom with an operational feel giving mechanismcomprising a plurality of depressions while said projecting connector isprovided with an operational feel giving member adapted to be pressedagainst said depression under a biasing effect.

On a fourteenth aspect, the present invention proposes another preferredembodiment of the control device comprising: a cylindrical control knob,an interlocking gear in the form of a bevel gear integrally mounted on aouter periphery of said control knob, a sun gear adapted to engage withsaid interlocking gear and serving for transmission of a driving forcefrom said control knob, a base member rotatably supporting said controlknob, said interlocking gear and said sun gear is provided with a planetgear adapted to move in association with said sun gear, said base memberis provided with a gear case including therein a control cableassociated with said planet gear to operate an external device, said sungear, said planet gear and an internal gear cooperating with said sungear to guide said planet gear in a given direction, and said gear caseis provided with an operational feel giving portions while said planetgear is provided with an operational feel giving member adapted to bepressed against said operational feel giving portions under a biasingeffect.

On a fifteenth aspect, the present invention proposes another preferredembodiment of the control device wherein one of said sun gear and saidgear case is provided with the operational feel giving portions whilethe other is provided with the operational feel giving member adapted tobe pressed against said operational feel giving portions under a biasingeffect.

Effect of the Invention

Effects provided by the present invention will be described with respectto the respective aspects of the invention.

The dial control device on the first aspect of the present inventioncomprises a cylindrical control knob, a sun gear rotating integrallywith said control knob for transmission of a driving force from saidcontrol knob, a planet gear interlocking with said sun gear, an internalgear cooperating with said sun gear to guide said planet gear in adirection of its movement, and a control cable coupled to said planetgear so as to operate an external device. Such arrangement makes itpossible to simplify the gear assembly.

The dial control cable (inner cable) is connected to the planet gearadapted to be moved by cooperation of the sun gear and the internal gearso that the control cable maybe advanced or retracted in associationwith revolving of the planet gear. This feature allows a stroke of thecontrol cable to increase. Consequently, the control device suitable fordownsizing of the device configuration is obtained.

In the dial control device according to the first aspect of theinvention, the control knob is cylindrical and this feature isadvantageous in that, when operating switches are disposed within thecylindrical control knob as in the case of the second aspect of theinvention, operation control by the control knob and the other operationcontrol by the operating switches can be carried out in a consolidatedfashion without interference with the gear assembly since the latter issimplified.

Thus it is possible for a single control knob to perform a plurality ofoperation control functions.

Operating portions of the operating switches can be arranged in aconsolidated fashion, advantageously leading to improvement offunctionality and space availability on the control panel. controlpanel.

On a third aspect, the present invention proposes the dial controldevice comprising a base member rotatably supporting said control knob,a control cable having an outer cable slidably containing therein aninner cable, and a clamp member mounted on said base member and adaptedto fix one end of said outer cable at a predetermined position, whereinsaid inner cable is connected to said planet gear at an eccentriclocation spaced from a rotational center of said planet gear and saidclamp member is placed on an extension of a line connecting a pair ofopposite ends of movement locus (approximately rectilinear locus) ofsaid eccentric location within a rotatable range of said control knob.With such arrangement, oscillation possibly occurring on the end of theinner cable due to revolving locus of the planet gear can be restrictedsince it is assured that the inner cable of the control cable movessubstantially along a rectilinear locus. Compared to the case in whichthe inner cable is connected to the rotational center of the planet gearand revolves along a locus describing a circular arc, a flexural stressexerted on the inner cable can be alleviated and thereby thefunctionality of the control knob can be improved.

On a fourth aspect, the present invention proposes the dial controldevice comprising a base member rotatably supporting said control knob,a control cable having an outer cable slidably containing therein aninner cable, a clamp member mounted on said base member and adapted tofix one end of said outer cable at a predetermined position, aninterlocking gear in the form of a bevel gear mounted around an outerperiphery of said cylindrical control knob, a planet gear in the form ofa spur gear and rotatably mounted on said base member, a sun gearincluding a bevel gear engaging said interlocking gear and a spur gearengaging said planet gear and rotatably supported by said base member,and an internal gear cooperating with said sun gear to guide said planetgear in a direction of its movement. Such construction is advantageous,like in the case of the control device on the first aspect of theinvention, to downsize the control device.

This construction is suitable for the control device having the controlcable extending in the direction intersecting with the direction inwhich the control knob is rotated.

On a fifth aspect, the present invention proposes the dial controldevice wherein the planar portion of the base member is formed with anelongate notch and the planet gear is provided with a projectingconnector adapted to be movably inserted into said notch and connectedto said control cable behind said planar portion.

Thereby a possibility that the projecting connector on the planet gearmight interfere with the base member can be minimized. In addition, thespace in which the projecting connector on the planet gear is movablecan be commonly utilized with the space used to lay the control cable.In this way, the space available for the gear mechanism and the controlcable can be significantly reduced.

It is also possible to replace the notch formed in the base member bythe square U-shaped notch into which the projecting connector on theplanet gear is inserted and to connect the control cable to theprojecting connector within the square U-shape notch like in the case ofthe control device on the sixth aspect of the invention.

On a seventh aspect, the present invention proposes the dial controldevice wherein said cylindrical control knob contains therein anoperating member adapted to perform an operational control independentfrom the operational control performed by said control cable. Suchconstruction is advantageous from the viewpoint of the spaceavailability for the device components as well as downsizing of thedevice as a whole.

It should be understood that the operating member for the operationalcontrol independent from the operational control performed by thecontrol cable is not limited to the electric switch and, for example, itis also possible to replace the electric switch by a mechanism adaptedto control the operation of the control cable.

On an eighth aspect, the present invention proposes the dial controldevice wherein the projecting connector is mounted on the planet gear atan eccentric location spaced from the rotational center of the planetgear so that the projecting connector moves along a rectilinear locus asthe planet gear revolves and moves. In consequence, the control cablealso can move rectilinearly.

Furthermore, the cable holder is disposed just on the extension of suchlocus of the projecting connector and thereby a flexural stress exertedon the control cable is drastically alleviated. Consequentially, thefunctionality of the control knob is significantly improved.

On a ninth aspect, the present invention proposes the dial controldevice comprising an interlocking gear in the form of a bevel gearmounted on an outer periphery of a cylindrical control knob, a planetgear formed by a spur gear and movably disposed on said base member, anda sun gear integrally consisting of a bevel gear adapted to engage withsaid interlocking gear and a spur gear having a diameter smaller than adiameter of said bevel gear and adapted to engage with said planet gear,said sun gear being rotatably supported by said base member with saidspur gear placed aside toward the base member.

The unique gear placement such that the planet gear partially overlapsthe bevel gear of the sun gear advantageously reduces the dimensions (adepth dimension of the device+a dimension of the device as measured in adirection of the rotational axes of the sun gear and the planet gear) ofthe gear assembly and thereby the space availability is improved so asto downsize the gear mechanism.

On a tenth aspect, the present invention proposes the dial controldevice having a unique construction that the gear case provided with theinternal gear is fixed to the base member and the sun gear is rotatablysupported by the gear case and the base member so as to prevent theplanet gear from being out of engagement with the sun gear.

In this construction, the gear case serves as a bearing case for theinternal gear cooperating with the sun gear to guide the planet gear andfor the sun gear.

The gear case serves also to protect the gears from being injured due toany impact and being contaminated with dust.

On an eleventh aspect, the present invention proposes the dial controldevice which is suitable to lay the control cable in a directionintersecting with the direction in which the control knob isrotationally operated without making the gear mechanism bulky.

On a twelfth aspect, the present invention proposes the dial controldevice adapted to control the control cable by rotationally operatingthe cylindrical control knob and thereby to operate the external device.In addition, the device includes the operational feel giving mechanismconsisting of the operational feel giving member provided on the planetgear and the associated operational feel giving depressions formed onthe base member so that the stroke of the control cable preciselydepends on the distance over which the planet gear moves.

In other words, the stroke of the control cable is substantially notaffected by a backlash possibly occurring between the gears, allowingthe dial control device to operate at a high accuracy.

In response to rotation of the control knob at relatively largeintervals of the operational feel, the planet gear moves from oneoperational feel to a next operational feel at relatively shortintervals. Therefore there is no anxiety that the planet gear might stopits movement before the control knob rotates to next operational feeland thus the maneuverability of the dial control device iscorrespondingly improved.

On a thirteenth aspect, the present invention proposes the dial controldevice wherein the operational feel giving mechanism consisting of theoperational feel giving member provided in the projecting connector onthe planet gear and the depressions arranged in the bottom of the squareU-shaped notch formed in the base member through which the control cableis advanced or retracted. With such unique construction, the stroke ofthe control cable corresponds to the interval of the operational feelgiving depressions.

In addition to the effect derived from the dial control device accordingto the first aspect of the invention, the dial control device can beeasily designed depending on the specification of the external device.

On a fourteenth aspect, the present invention proposes the controldevice having the operational feel giving mechanism consisting of anoperational feel giving depressions formed in the gear case and theassociated operational feel giving member in the planet gear. Similarlyto the dial control device according to the first aspect of theinvention, the stroke of the control cable is substantially not affectedby a backlash and it is not apprehended that the planet gear might stopits movement before the control knob rotates to the next operationalfeel. Furthermore, it is unnecessary to provide the operational feelgiving depressions and the construction of the base member which wouldotherwise be complicated due to consolidation of various functions canbe simplified.

On a fifteenth aspect, the present invention proposes the dial controldevice wherein one of the sun gear and the gear case is provided withthe operational feel giving portions while the other is provided withthe associated operational feel giving member.

Consequentially, this dial control device is inevitably affected by abacklash between the sun gear and the planet gear and an error occurringin the stroke of the control cable is more significant than in the caseof the dial control devices according to the first, second and thirdaspects of the invention. However, such stroke error is substantiallysmaller than in the case of the dial control device of prior art.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view showing the control device according to a firstembodiment.

FIG. 2 is a sectional view showing the control device according to thefirst embodiment.

FIG. 3 is a diagram schematically illustrating an important part of thecontrol device according to the first embodiment.

FIG. 4 is a front view showing the control device according to a secondembodiment.

FIG. 5 is a sectional view showing the control device according to thesecond embodiment.

FIG. 6 is a plan view showing the control device according to the secondembodiment.

FIG. 7 is a diagram schematically illustrating an important part of thecontrol device according to the second embodiment.

FIG. 8 is a sectional view showing the control device according to athird embodiment.

FIG. 9 is a diagram schematically illustrating an important part of thecontrol device according to the third embodiment.

FIG. 10 is a diagram schematically illustrating a manner of connectionof the control cable in the control device according to the thirdembodiment.

FIG. 11 is a diagram schematically illustrating an important part of thecontrol device according to a fourth embodiment.

FIG. 12 is a perspective view showing the control device for airconditioning unit of a motor vehicle according to a fifth embodiment ofduplex control knob fashion.

FIG. 13 is a sectional view showing the control device according to thefifth embodiment taken in one of the control knobs.

FIG. 14 is an exploded perspective view showing the control deviceaccording to the fifth embodiment.

FIG. 15 is a partial plan view showing the control device according tothe fifth embodiment.

FIG. 16 is a partial plan view showing the control device according tothe fifth embodiment as the gear case has been removed to reveal theinner structure.

FIG. 17 is a rear view showing the gear case of the control deviceaccording to the fifth embodiment.

FIG. 18 is a partial sectional view showing a manner of connectionbetween the boss of the planet gear and the inner cable of the controlcable in the control device according to the fifth embodiment.

FIG. 19 is a partial bottom view of the control device according to thefifth embodiment, showing layout of the control cable.

FIG. 20 is a diagram schematically illustrating a position at one side(A), a middle position (B) and a position at the other side (C) to whichthe planet gear rotationally moves as the control knob is operated inthe control device according to the fifth embodiment.

FIG. 21 is a sectional view similar to FIG. 18, showing a concave grooveas a variant of the notched opening in the control device according tothe fifth embodiment.

FIG. 22 is a partial bottom view showing the control device providedwith said concave groove.

FIG. 23 is an exploded perspective view showing the control deviceaccording to a sixth embodiment.

FIG. 24 is a sectional view showing an important part of the controldevice according to the sixth embodiment.

FIG. 25 is a rear view showing the control device according to the sixthembodiment.

FIG. 26 is a front view showing the control device for air conditioningunit of a motor vehicle according to a seventh embodiment.

FIG. 27 is a bottom view showing the control device according to theseventh embodiment.

FIG. 28 is a sectional view taken along a line B-B in FIG. 26.

FIG. 29 is an exploded perspective view showing the control deviceaccording to the seventh embodiment.

FIG. 30 is a partial plan view showing the control device according tothe seventh embodiment.

FIG. 31 is a partial plan view showing the control device according tothe seventh embodiment as the gear case has been removed to reveal theinner structure.

FIG. 32 is a rear view showing the gear case included by the controldevice according to the seventh embodiment.

FIG. 33 is a partial sectional view showing an operational feel givingmechanism incorporated in the control device according to the seventhembodiment.

FIG. 34 is a sectional view similar to FIG. 28, showing the controldevice for air conditioning unit of a motor vehicle according to aneighth embodiment.

FIG. 35 is a rear view showing the gear case according to the eighthembodiment.

FIG. 36 is a sectional view similar to FIG. 28, showing the controldevice for air conditioning unit of a motor vehicle according to a ninthembodiment.

FIG. 37 is a rear view showing the gear case according to the ninthembodiment.

FIG. 38 is a sectional view similar to FIG. 36, showing the controldevice for air conditioning unit of a motor vehicle according to avariant of the ninth embodiment.

FIG. 39 is a rear view showing the gear case according to the variant ofthe ninth embodiment.

FIG. 40 is a sectional view similar to FIG. 36, showing the controldevice for air conditioning unit of a motor vehicle according to anothervariant of the ninth embodiment.

FIG. 41 is a rear view showing the gear case according to anothervariant of the ninth embodiment.

FIG. 42 is a front view exemplarily showing the control devices of priorart.

FIG. 43 is a plan view of the control device of prior art shown by FIG.42.

FIG. 44 is a partial sectional view of the control device of prior artshown by FIG. 42.

FIG. 45 is a sectional view exemplarily showing another control deviceof prior art.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Now several embodiments of the present invention in the form of thecontrol device for air conditioning unit of a motor vehicle will bedescribed in details with reference to the accompanying drawings.

FIGS. 1, 2 and 3 illustrate a first embodiment wherein FIG. 1 is a frontview of the control device, FIG. 2 is a sectional view of this controldevice and FIG. 3 is a diagram schematically illustrating an importantpart of the control device.

As shown, the control device comprises a cylindrical control knob 61adapted to serve as the dial knob for temperature regulation and acontrol knob 62 in the form of a finger grip projection provided withinthe control knob 61 adapted to serve as the dial knob for airflowregulation.

The control knob 61 maybe rotated until an indicator 61 a is alignedwith a desired one of symbols 63 a arranged on a display 63T and therebythe temperature may be selectively regulated.

The control knob 62 may be rotated with the finger grip projection heldby fingers until an indicator 62 a is aligned with a desired one ofsymbols 63 b arranged on a display 63F and thereby the airflow may beselectively regulated.

A rear portion of the cylindrical control knob 61 is formed on its outerperipheral surface with a sun gear 61 b adapted to engage with a planetgear 64.

The control knob 61 is rotatably mounted around an outer periphery of acylindrical portion 65 a extending within a case 65 and provided with aclick-stop mechanism (not shown) allowing the indicator 61 a to berotationally moved from the symbol 63 a to the symbol 63 a withoperational feel.

While the control knob 61 may be rotatably supported by the cylindricalportion 65 a extending within the case in various manners, according tothis embodiment, the control knob 61 is formed on its inner peripheralsurface with a ring-shaped concave portion 61 c and the cylindricalportion 65 a extending within the case is integrally formed with astopper 65 b adapted to engage with one end of the concave portion 61 cto prevent the control knob 61 from dropping off.

Preferably, said stopper 65 b is provided at a plurality of regions onthe outer peripheral surface of the cylindrical portion 65 a extendingwithin the case.

An immovable cylindrical body 66 is fixed to the front of thecylindrical portion 65 a extending within the case.

Specifically, the immovable cylindrical body 66 is provided with lockingholes 66 a and the stoppers 65 b of the cylindrical body 65 a areengaged with the associated locking holes 66 a to fix the immovablecylindrical body 66 to the cylindrical portion 65 a extending within thecase.

The immovable cylindrical body 66 is provided within its front end witha plurality of radial bridging plates 67 by which an inner cylindricalbody 68 is supported and the control knob 62 is rotatably inserted intothis inner cylindrical body 68.

An operating shaft 69 of an airflow regulating switch 69 is fitted intoa knob shaft 62 b of the control knob 62.

The airflow regulating switch 69 is provided within a rear case 70.

On the front side of the bridging plates 67 extending between theimmovable cylindrical body 66 and the inner cylindrical body 68, adisplay plate 71 carrying thereon the displays 63T, 63F are affixed.

In this display plate 71, the symbols 63 a, 63 b are translucent and theremaining region is non-translucent so that the symbols 63 a, 63 b areoptically displayed as a lamp 73 mounted on a circuit substrate isturned on.

The case 65 is formed with a shaft guiding slot 74 describing a circulararc along which a gear shaft 64 a of the planet gear 64 inserted thereinis guided. This shaft guiding slot 74 cooperates with an internal gear75 provided on the upper portion of the case 65 to guide rotary movementof the planet gear 64.

The gear shaft 64 a projecting outward from the case 65 is provided witha connector member 77 for an inner cable 76 a of a control cable 76.

This connector member 77 is rotatable with respect to the gear shaft 64a.

It should be noted that it is also possible to connect the inner cable76 a directly to the gear shaft 64 a of the planet gear 64 withoutdeparting from the scope of the invention.

The control cable 76 may be of the well known type and comprises anouter cable 76 b and the inner cable 76 a slidably movable within theouter cable 76 b wherein, as will be apparent from FIG. 3, one end ofthe outer cable 76 b is fixed to a clamp member 78 provided on the case65 and one end of the inner cable 76 a is attached to said connectormember 77.

In the control device as has been described above, the sun gear 61 brotates integrally with the control knob 61 as the latter is rotatedand, in engagement with the sun gear 61 b, the planet gear 64 moves in arange defined by positions 64A and 64B as illustrated by FIG. 3.

In this way, the inner cable 76 a is advanced and retracted in responseto movement of the planet gear 64, i.e. , to rotary operation of thecontrol knob 61 and thereby operation of the air conditioning unit asthe external device is controlled to achieve the temperature regulation.

FIGS. 4 through 7 illustrate a second embodiment wherein FIG. 4 is afront view of the control device, FIG. 5 is a sectional view of thecontrol device, FIG. 6 is a plan view of the control device and FIG. 7is a diagram schematically illustrating an important part of the controldevice.

The present embodiment is similar to the first embodiment except that aninterlocking gear 81 having a bevel gear is fixed to a rear end of thecontrol knob 61 coaxially therewith, a sun gear 82 is engaged with saidinterlocking gear 81 and a planet gear 83 is engaged with the sun gear82.

The sun gear 82 according to the present embodiment comprises the bevelgear engaged with the interlocking gear 81 and a spur gear engaged withthe planet gear 83 wherein this sun gear 82 is rotatably supported by agear shaft 65 d set up integrally with the case 65.

The planet gear 83 has a gear shaft 83 a inserted into a shaft guidingslot 84 formed in the case 65 and describing a circular arc around thegear shaft 65 d of the sun gear 82. The planet gear 83 is moved byengaging with the bevel gear of the sun gear 82 and a circulararc-shaped gear mounted on the case 65.

According to the present embodiment, the connector member 77 forconnection of the inner cable 76 of the control cable 76 is provided atan eccentric position with respect to the rotational center of theplanet gear 83.

Thus the inner cable 76 a is connected at the eccentric position of theplanet gear 83 and the clamp member 78 is located on an extension of theline connecting opposite ends of rotary locus described by the connectormember 77 located at said eccentric position within a rotatable range ofthe control knob 61.

The connector member 77 is rotatably attached to the planet gear 83.

The connector member 77 is preferably provided at the eccentric positionspaced aside from the rotational center of the planet gear 83 toward thesun gear 82 at the neutral position of the planet gear 83 so that theconnector member 77 may describe a locus of movement coming close to thesun gear 82.

Such design allows the clamp member 78 to be located closer to the sungear 82 and thereby allows the case 75 to be downsized.

According to the second embodiment as has been described above, inresponse to rotational operation of the control knob 61, the sun gear 82engaged with the interlocking gear 81 is rotated around the gear shaft65 d.

More specifically, the planet gear 83 interlocking with the spur gear ofthe sun gear 82 revolves around the sun gear 82 and moves in a rangedefined between a position 83A indicated by solid lines and a position83B indicated by chain lines in FIG. 7 in response to rotationaloperation of the control knob 61.

According to the present embodiment, within a rotatable range of thecontrol knob 61, the connector member 77 describes its rotation locusextending from the position 77A to the position 77B as shown by FIG. 7in response to movement of the planet gear 83. The clamp member 78 islocated on an extension of the line connecting opposite positions 77A,77B of rotary locus described by the connector member 77.

In this way, the movement locus of the inner cable describesapproximately linear locus and thereby a flexure stress generated in theinner cable can be alleviated.

In view of the fact that the clamp member 78 is fixed to the case 65,the connection member 77 is preferably mounted on the planet gear 83 insuch a manner that a movement locus of the connector member 77 isdescribed aside toward the sun gear 82.

Such design allows the clamp member 78 to be located closer to the sungear 82 and thereby allows the case 75 to be downsized.

In the control device according to the second embodiment, the sun gear82 is engaged with the interlocking gear 81 to be rotated around thegear shaft 65 d and thereby the planet gear 83 is engaged with the sungear 82 to be revolved around the sun gear 82.

In this way, the inner cable 76 a of the control cable 76 is advancedand retracted in response to rotary movement of the interlocking member77 and thereby operation of the air conditioning unit is controlled toachieve the temperature regulation.

FIGS. 8, 9 and 10 illustrate a third embodiment wherein FIG. 8 is asectional view of the control device, FIG. 9 is a diagram schematicallyillustrating an important part of the control device and FIG. 10 is adiagram schematically illustrating a manner in which the control cableis connected to the planet gear.

The present embodiment is similar to the second embodiment except thatthe sun gear 82 in the second embodiment is replaced by a sun gear 86including a sectoral bevel gear 86 a.

More in details, the sun gear 86 in this embodiment comprises the bevelgear 86 a, the spur gear 86 b engaged with the planet gear 83. The sungear 86 has a ring-shaped gear shaft 86 c rotatably mounted on a part ofthe case 65.

According to this embodiment, the control knob 61 may be rotationallyoperated to control operation of the air conditioning unit via theinterlocking gear 81, the sun gear 86, the planet gear 83 and thecontrol cable 76 in the same manner as in the control device accordingto the second embodiment.

FIG. 11 is a schematic diagram similar to FIGS. 3, 7 and 10,illustrating an important part of the control device according to afourth embodiment.

The present embodiment is characterized in that the planet gear 88interlocking with the sun gear 87 is provided with a pivoting member 89.

Specifically, the pivoting member 89 has one end fixed to a centralportion of the planet gear 88 and the other end provided with theconnector member 77 for the control cable 76. In addition, the clampmember 78 is provided on the extension of the line connecting the oneend 77A, to the other end 77B of e rotary locus described by theconnector member 77.

In the present embodiment characterized in that the planet gear 88 isprovided with the pivoting member 89, a length of the pivoting member 89may be selectively adjusted.

The connector member 77 is mounted on the pivoting member 89 preferablyat an eccentric position spaced from the center of the planet gear 88 sothat the movement locus described by the connector member 77 may comeclose to the sun gear 87, as will be apparent from FIG. 11.

Such design allows the clamp member 78 to be located closer to the sungear 87 and thereby allows the case 75 to be downsized.

Referring to FIG. 11, reference numerals 88A, 88B designates a pair ofopposed positions to which the planet gear 88 can be moved.

It will be easily appreciated by those skilled in the art that theplanet gear 64 in the first embodiment as well as the planet gear 83 inthe second and third embodiments can be also provided with the pivotingmember 89.

While the first to fourth embodiments have been described hereinabove,these embodiments may be respectively modified or varied withoutdeparting from the scope of the invention. For example, the circulararc-shaped internal gear 75 may be replaced by a ring-like gear. Theswitch adapted to be turned on or off by the control knob 62 may bereplaced by a plurality of individual switches or contacts arranged onthe circuit substrate so as to be switched by the control knob.Furthermore, the switches provided within the control knob 61 may beimplemented in the form of a push switch or rotary switch.

In the control device as has been described hereinabove, the gearassembly comprises the sun gear, the planet gear and the internal gearor comprises the interlocking gear, the sun gear, the planet gear andthe internal gear. Such set of the gears is suitable for downsizing ofthe gear assembly so as to be housed within the case.

Consequentially, the control knobs can be made in a common configurationand therefore it is possible to provide the dial control devicecomprising a plurality of control units having different functionsselectively combined depending on the type of motor vehicle.

For example, TEMP knob unit, MODE knob unit, FAN knob unit and the otherknob unit may be individually constructed, thereafter these units may becombined according to a particular design and installed.

Now the control device for air conditioning unit of a motor vehicleaccording to a fifth embodiment will be described in reference with theaccompanying drawings.

FIG. 12 is a perspective view showing the control device of duplexcontrol knob fashion, FIG. 13 is a sectional view showing the controldevice taken in one of the control knobs and FIG. 14 is an explodedperspective view showing this control device.

First of all, a control knob 131 and an interlocking mechanism thereofwill be described.

The control knob 131 is a dial knob for temperature regulation and thiscontrol knob 131 contains within a cylindrical portion thereof a controlknob 132 in the form of a finger-grip protuberance serving as a dialknob for airflow regulation.

In operation, the control knob 131 may be rotated until an indicator 131a thereof is aligned with a desired symbol 133 a to achieve selectivetemperature regulation.

Gripping the protuberance with the fingers, the control knob 132 may berotated until an indicator 132 a thereof is aligned with a desiredsymbol 133 b to achieve selective airflow regulation.

As illustrated by FIGS. 13 and 14, the cylindrical control knob 131integrally has, around its rear end, an interlocking gear 134 in theform of a bevel gear with which a sun gear 135 engages and therebycauses a planet gear 136 to revolve.

This control knob 131 is rotatably mounted on an outer periphery of acylindrical portion 137 a extending within a front base 137.

More specifically, the interlocking gear 134 integral with the controlknob 131 is formed therein with a ring-shaped step 134 a adapted tolatch together with a projecting stopper 137 b formed on saidcylindrical portion 137 a to prevent the control knob 131 from droppingoff.

It should be noted that the projecting stopper 137 b is formed at two ormore locations on the outer periphery of the cylindrical portion 137 a.

A circular flange of this interlocking gear 134 is provided at severallocations of its outer periphery with projecting stoppers 134 c adaptedto engage with the associated grooves formed on an inner periphery ofthe control knob 131 to ensure that the interlocking gear 134 rotatesintegrally with the control knob 131.

Said interlocking gear 134 is provided with a click stop mechanismallowing a vehicle driver to experience an operational feel in thecourse of operating the control knob 131 to align the indicator 131 a ofthe control knob 131 with a desired one of the symbols 133 a.

Specifically, this click stop mechanism comprises, as shown by FIG. 14,small balls 139 inserted into small pits 134 b formed on theinterlocking gear 134 biased by springs 138 to move inward in radialdirection and operational feel giving grooves 137 c formed on the frontbase 137.

Said cylindrical portion 137 a integrally includes a front plate formedwith a plurality of through-holes 140 arranged along a circumferencethereof serving to illuminate said symbols 133 a, 133 b.

A displaying plate 141 is fixed to said front plate so as to close saidthrough-holes 140.

This displaying plate 141 is translucent at its regions covering thesymbols 133 a, 133 b and non-translucent at the remaining region so thatthe symbols 133 a, 133 b may be optically displayed by energizing a lamp143 mounted on a wiring substrate 142.

A light guiding member 144 (See FIG. 14) is attached to the control knob131 in order that the indicator 131 a is optically displayed by a lightsource such as LED mounted on the wiring substrate 142 and a lightguiding member 145 is attached to the control knob 132 in order that theindicator 132 a is optically displayed by the light source such as LEDmounted on the wiring substrate 142.

The control knob 132 is rotatably inserted into the opening formed inthe central cavity of said front plate.

An operating shaft 146 a of an airflow regulating switch 146 is fittedinto a knob shaft 132 b of this control knob 132.

Said wiring substrate 142 and the airflow regulating switch 146 areprovided within the rear case 147.

The sun gear 135 adapted to engage with the interlocking gear 134mounted on the control knob 131 integrally includes a bevel gear 135 aand s spur gear 135 b having a diameter smaller than that of the bevelgear 135 a wherein the sun gear 135 with the spur gear 135 b lying onthe downside is rotatably supported around a shaft 148 verticallystanding from the rear base 147.

The planet gear 136 in the form of a spur gear engages with the spurgear 135 b of the sun gear 135.

Specifically, the planet gear 136 revolves by interlocking with the sungear 135 and moves on a planar portion 147 a forming a part of the rearbase 147, as shown by FIG. 13.

As will be also apparent from FIG. 13, the planar portion 147 a iseccentrically located with respect to a rotation center of the controlknob 132.

In this way, a central space is assured behind the control device andthis space is available dispose various electric switches such as a fanswitch 146.

Said space is available not only to dispose the electric switches butalso to dispose various mechanical parts such as gears and levers usedto manipulate the control cable.

In addition, it is also possible to assure a relatively large space todispose the wiring substrate 142 and therefore the wiring substrate 142can be provided with correspondingly much more number of electronicparts to improve the functionality of the wiring substrate 142.

The planar portion 147 a is provided with a projection 147 c with whichthe lower surface of the planet gear 136 moves in slidable contact andthereby a sliding resistance is alleviated.

According to the present embodiment, a gear case 149 fixed by screws tothe rear base 147.

Specifically, the gear case 149 is fixed along its periphery to the rearbase 147 by means of the screws 150 as will be seen in FIG. 15 andprovided at a central region with a screw 151 adapted to be entwistedinto the shaft 148 to prevent the sun gear 149 and the planet gear 136from dropping off.

An upper wall of the gear case 149 is provided with an inner rib 149 aadapted to come in contact with the sun gear 135 and a bottom wall isprovided with an inner rib 149 b adapted to come in contact with theplanet gear 136.

Said gear case 149 is further provided with an internal gear 152 adaptedto cooperate with the sun gear 135 to guide the movement of the planetgear 136.

As FIG. 17 illustrates in an enlarged scale, the gear case 149 isprovided with the circular arc-shaped internal gear 152 so that theplanet gear 136 is rotated and moved by the driving force from the sungear 135 between this internal gear 152 and the sun gear 135.

FIG. 17 is a rear view of the gear case 149.

Said gear case 149 includes along its periphery one or more tongue 153so that this or these tongue(s) may be fitted into the associatedpositioning groove(s) 147 b formed in the rear base 147 for positioningand then affixed to the rear base 147 by means of screws 150, 151.

Regarding the internal gear 152, instead of providing the internal gear152 in the gear case 149, it may be provided in the form of a circulararc-shaped gear on the rear base to guide the planet gear 136 asproperly as the internal gear 152 provided in the gear case 149.

Said planet gear 136 is provided with a projecting connector 136 a towhich the inner cable 154 a of the control cable 154 is connected.

As will be apparent from FIGS. 13, 15 and 16, the projecting connector136 a extends downward at an eccentric position with respect to therotation center of the planet gear 136 through a notch 155 formed in theplanar portion 147 a of the rear base 147 to the rear side of the planarportion 147 a.

FIG. 15 is a partial plan view showing an interlocking mechanism of thecontrol knob 131 and FIG. 16 is a plan view showing the sameinterlocking mechanism but with the gear case 149 removed to reveal theinner construction.

The notch 155 in the planar portion 147 a of the rear base 147 isprovided in the form of a rectilinear slot having a length correspondingto a distance along which the projecting connector 136 a can move as thecontrol knob 131 is operated in its maximum rotational range.

Specifically, the sun gear 135 as well as the planet gear 136 may beappropriately designed and the projecting connector 136 a may be locatedeccentrically with respect to the planet gear 136 to ensure that theprojecting connector 136 a moves substantially along a rectilinear pathas the planet gear 136 moves around the sun gear 135.

The notch 155 is formed without any possibility that the notch 155 mightinterfere with the rear base 147 in a range within which the projectingconnector 136 a of the planet gear 136 moves.

In consequence, the projecting connector 136 a can smoothly move withinthe notch 155 as the control knob 131 is rotated.

The control cable 154 comprises an outer cable 154 b and an inner cable154 a slidably contained within this outer cable wherein one end of theinner cable 154 a is connected to the projecting connector 136 aprojecting outward through the notch 155.

In this way, as shown by FIGS. 18 and 19, the inner cable 154 a can beconnected to the projecting connector 136 a on the rear side of theplanar portion 147 a of the rear base 147 and the control cable 154 canbe disposed on the rear side of the rear base 147.

More specifically, one end of the outer cable 154 b is held by a cableholder (i.e., clamp member) 156 mounted on the rear side of the rearbase 147 (i.e., on the rear side of the planar portion 147 a) andthereby the control cable can be stably installed.

Consequentially, the space in which the projecting connector 136 a ofthe planet gear 136 moves can be commonly available with the space usedto install the control cable 154, allowing a vertical dimension of thedevice to be downsized.

The cable holder 156 may be located on the extension of thesubstantially rectilinear motion locus of the projecting connector 136 ato ensure that a flexural stress exerted on the control cable 154 isalleviated and a functionality of the control knob 131 is improved.

FIG. 18 is a sectional view taken along a line B-B in FIG. 16 and FIG.19 is a bottom view showing the interlocking mechanism of the controlknob 131.

In operation of the control device as has been described above, thecontrol knob 131 is rotated until the indicator 131 a thereof is alignedwith the desired symbol 133 a whereupon the sun gear 135 engaging withthe interlocking gear 134 rotates integrally with the control knob 131around the shaft 148.

In consequence, the planet gear 136 engaging with the spur gear 136 b ofthe sun gear 135 moves under the guiding effect of the sun gear 135 andthe internal gear 152.

Specifically, the planet gear 136 revolves around the spur gear 135 b ofthe sun gear 135 sequentially passing the positions (A) to (C) or (C) to(A) depending on the direction in which the control knob 131 is rotatedand the projecting connector 136 a moves within the notch 155 describinga substantially rectilinear locus.

In response to this, the inner cable 154 a of the control cable 154 isadvanced or retracted, causing the air conditioning unit to regulate thetemperature.

Reference numerals L1 and L2 in FIG. 20 designate cable strokes.

In operation of the control knob 132, the finger-grip protuberance isheld with the fingers and rotated until the indicator 132 a thereof isaligned with the desired symbol 133 b.

Thereupon the airflow regulating switch 146 is turned on and a fan motorfor airflow regulation is controlled.

While the control knobs 131, 132 and the interlocking mechanism thereofhave been described above, the other control knob is for wind directionregulation of which the interlocking mechanism is of constructionsimilar to that for a control knob 161.

Namely, the control knob 161 is rotated until the indicator 161 athereof is aligned with the desired symbol 162 a whereupon aninterlocking gear 163, a sun gear 164 and a planet gear 165 engage onewith another so that the projecting connector 165 a on the planet gear165 moves to advance or retract the inner cable 166 a of a control cable166.

In this way, the wind direction of the air conditioning unit iscorrespondingly changed over.

The control cable 166 comprises an outer cable 166 b and an inner cable166 a slidably contained within the outer cable 166 b.

Within the cylindrical control knob 161, push buttons 167, 168 and 169are provided respectively associated with a rear defroster switch, anair conditioning switch and an indoor air circulation/outdoor air intakeexchanging switch.

Upon depression of these push buttons 167, 168, 169, sliders 170 a, 170b, 170 c shown in FIG. 14 are moved to actuate push switches 171 a, 171b, 171 c mounted on the wiring substrate 14.

Reference numerals 172, 173, 174 in FIG. 14 designate light guidingmembers, reference numeral 175 designates a lamp for night lighting,reference numeral 176 designates a display plate for symbol 162 a, andreference numeral 177 designates a gear case.

The front base 137 and the rear base 147 are fixed together by means ofscrews and a panel member 178 is fixed to a front surface of the frontbase 137 by means of screws.

As has previously been described, the control knob 132 for airflowregulation is installed inside the control knob 131 for temperatureregulation while the push button 167 for the rear defroster switch, thepush button 168 for the air conditioning switch and the push button 169for indoor air circulation/outdoor air intake switch are disposed insidethe control knob 161 for wind direction regulation. With suchconstruction, it is possible to arrange the various switches necessaryfor air conditioning in a motor vehicle can be in a consolidated waywithin a pair of the cylindrical control knobs 131, 161 and thereby notonly to downsize the control device but also to improve thefunctionality of the control device.

By arranging the air conditioning functions in such a consolidated way,the wiring substrate 142 can be concentrated and thereby miniaturized,allowing a production cost to be reduced.

The components other than the wiring substrate 142 such as a panel 178,the control knobs 131, 161, the front base 137, the rear base 147 andthe gear cases 149, 177 can be made common to the two control knobs andthis feature also leads to reduction of production cost.

While the preferred embodiment has been described above, the notch 155formed in the planar portion 147 a of the rear base 147 may replaced bya Square U-shaped groove.

Specifically, the planar portion 147 a of the rear base 147 may beformed with an elongate square U-shaped groove 179 having an opening 179a at one end, as shown by FIG. 21, so that the projecting connector 136a of the planet gear 136 may movably enter into this square U-shapedgroove 179.

The inner cable 154 a having one end connected to the projectingconnector 136 a may be pulled out from the opening 179 a and, as shownby FIG. 22, the outer cable 154 b containing therein the inner cable 154a is held by a cable holder (i.e., clamp member) 180 mounted on the rearside of the rear base 147.

While the fifth embodiment of the present invention has been describedabove, it is possible to implement this control device in the form ofduplex type dial control device for air conditioning unit of a motorvehicle comprising a combined operating portion which, in turn,comprises the control knob serving as one of the cylindrical controlknob 161 for wind direction regulation or the control knob 131 fortemperature regulation and the control knob provided within thiscylindrical control knob 132 for airflow regulation, on one hand, and acombined operating portion which comprises the other of said cylindricaltwo control knobs and the push button 167 for the rear defroster switch,the push button 168 for the air conditioning switch and the push button169 for indoor air circulation/outdoor air intake exchanging switch alldisposed with said other cylindrical control knob, on the other hand.

Now a sixth embodiment will be described in reference with FIGS. 23, 24and 25.

The control device according to this embodiment is similar to thecontrol device according to said fifth embodiment except that thepush-button 167 for rear defroster switch, the push-button 168 for airconditioning and the push-button 169 for indoor air circulation/outdoorair intake exchanging switch disposed within said cylindrical controlknob 161 are replaced by a control knob 181 having a finger-gripprojection so that a control cable 182 maybe controlled by rotating thiscontrol knob 181.

FIG. 23 is an exploded perspective view similar to FIG. 14, showing thecontrol device, FIG. 24 is a sectional view similar to FIG. 13, showingthe interlocking mechanism for the control knob 161 and FIG. 25 is arear view showing the control device according to the presentembodiment.

As shown, a control knob 181 is movably disposed within the cylindricalcontrol knob 161 and this control knob 181 may be rotated until itsindicator 181 a is aligned with a desired symbol 184 on a display plate183 to control a control cable 182 and thereby to switch the mode ofindoor air circulation/outdoor air intake.

This display plate 183 includes, in addition to said symbol 184, thesymbol 162 a with which the indicator 161 a associated with the controlknob 161 is to be aligned.

Specifically, a knob shaft 181 b of the control knob 181 is coupled to afront end of a shaft 185 supported by the rear base 147 and aninterlocking lever 186 is coupled to a rear end of this shaft 185 tocontrol a control cable 182.

A inner cable 182 a of the control cable 182 is connected to theinterlocking lever 186 and an outer cable 182 b is held by a cableholder (i.e, clamp member) 187 mounted behind the rear case 147.

As shown in FIG. 24, the shaft 185 is provided with a small ball 189biased by a spring 188 to thrust forward while the rear case 147 isformed with a click groove adapted to receive the small ball 189 inorder that an operator of the control knob 181 can experience anoperational feel.

In the case of the control device according to the present embodiment,in response to rotational operation of the control knob 181, the innercable 182 a of the control cable 182 is advanced or retracted toexchange the mode of indoor air circulation/outdoor air intake.

In this way, the present invention can be implemented in the form of thecontrol device comprising the cylindrical control knob 131, 161containing therein a control knob serving to change over the electricswitch and the other control operations via the control cable as aninterlocking medium.

Now a sixth embodiment will be described in reference with FIGS. 23, 24and 25.

The control device according to the present embodiment is similar tosaid fifth embodiment except that the push button 167 for rear defrosterswitch, the push button 168 for air conditioning and the push button 169for indoor air circulation/outdoor air intake exchanging switch disposedwithin the cylindrical control knob 161 is replaced by a control knob181 in the form of a projecting finger-grip so that the control cable182 is controlled by rotating this control knob 181.

FIG. 23 is an exploded perspective view similar to FIG. 14, illustratingthe control device according to this embodiment, FIG. 24 is a sectionalview similar to FIG. 13, showing the interlocking mechanism of thecontrol knob 161, and FIG. 25 is a rear view showing the control deviceaccording to the present embodiment.

As shown, the control knob 181 is movably disposed within thecylindrical control knob 151 so that this control knob may be rotateduntil an indicator 181 a thereof is aligned with a desired symbol 184 tocontrol the control cable 182 and thereby to exchange of the indoor aircirculation/outdoor air intake.

The display plate 183 is provided with, in addition to the symbol 184,the symbol 162 a with which the indicator 161 a of the control knob 161is to be aligned.

Specifically, a knob shaft 181 b of the control knob 181 is coupled to afront end of a shaft supported on the rear base 147 and an interlockinglever 186 adapted to control the control cable 182 is coupled to a rearend of this shaft 185.

The inner cable 182 a of the control cable 182 is coupled to theinterlocking lever 186 and the outer cable 182 b is held by a cableholder (i.e., clamp member) mounted behind the rear case 147.

As will be seen in FIG. 24, the shaft 185 is provided with small ball189 normally biased by a spring 188 while the rear case 147 is formedwith a click groove adapted to receive the small ball 189 so that theoperator of the control knob 181 can experience an operational feel ofthe control knob 181.

The control device according to the present embodiment ensures that theinner cable 182 a of the control cable 182 is advanced or retracted inresponse to rotational operation of the control knob 181 and therebyindoor air circulation/outdoor air intake mode is switched.

In this way, the present invention can be implemented in the form of thecontrol device comprising the cylindrical control knob 131, 161containing therein a control knob serving to change over the electricswitch and the other control operations via the control cable as aninterlocking medium.

A seventh embodiment in the form of the control device for airconditioning unit of a motor vehicle will be described in reference withthe associated drawings.

First of all, a control knob 131 and an interlocking mechanism thereofwill be described.

FIG. 26 is a front view showing the control device of duplex controlknob fashion, FIG. 27 is a bottom view showing this control device, FIG.28 is a sectional view taken along a line C-C in FIG. 28, and FIG. 29 isan exploded perspective view of this control device.

First of all, a control knob 261 and an interlocking mechanism thereofwill be described.

The control knob 261 is a dial knob for temperature regulation and thiscontrol knob 261 contains within a cylindrical portion thereof a controlknob 262 in the form of a finger-grip protuberance serving as a dialknob for airflow regulation.

In operation, the control knob 261 may be rotated until an indicator 261a thereof is aligned with a desired symbol 263 a to achieve selectivetemperature regulation.

Gripping the protuberance with the fingers, the control knob 262 may berotated until an indicator 262 a thereof is aligned with a desiredsymbol 263 b to achieve selective airflow regulation.

As illustrated by FIGS. 28 and 29, the cylindrical control knob 261integrally has, around its rear end, an interlocking gear 264 in theform of a bevel gear with which a sun gear 265 engages and therebycauses a planet gear 266 to revolve.

This control knob 261 is rotatably mounted on an outer periphery of acylindrical portion 267 a extending within a front base 267.

More specifically, the interlocking gear 264 integral with the controlknob 261 is formed therein with a ring-shaped step 264 a adapted tolatch together with a projecting stopper 267 b formed on saidcylindrical portion 267 a to prevent the control knob 261 from droppingoff.

It should be noted that the projecting stopper 267 b is formed at two ormore locations on the outer periphery of the cylindrical portion 267 a.

A circular flange of this interlocking gear 264 is provided at severallocations of its outer periphery with projecting stoppers 264 b adaptedto engage with the associated grooves formed on an inner periphery ofthe control knob 261 to ensure that the interlocking gear 264 rotatesintegrally with the control knob 261.

Said cylindrical portion 267 a integrally includes a front plate formedwith a plurality of through-holes 270 arranged along a circumferencethereof serving to illuminate said symbols 263 a, 263 b.

A displaying plate 271 is fixed to said front plate so as to close saidthrough-holes 270.

This displaying plate 271 is translucent at its regions covering thesymbols 263 a, 263 b and non-translucent at the remaining region so thatthe symbols 263 a, 263 b may be optically displayed by energizing a lamp273 mounted on a wiring substrate 272.

A light guiding member 274 (See FIG. 29) is attached to the control knob261 in order that the indicator 261 a is optically displayed by a lightsource such as LED mounted on the wiring substrate 272 and a lightguiding member 275 is attached to the control knob 262 in order that theindicator 262 a is optically displayed by the light source such as LEDmounted on the wiring substrate 272.

The control knob 262 is rotatably inserted into the opening formed inthe central cavity of said front plate.

An operating shaft 276 a of an airflow regulating switch 276 is fittedinto a knob shaft 262 b of this control knob 262.

Said wiring substrate 272 and the airflow regulating switch 276 aredisposed within the rear case 277.

The sun gear 265 adapted to engage with the interlocking gear 264mounted on the control knob 261 integrally includes a bevel gear 265 aand s spur gear 265 b having a diameter smaller than that of the bevelgear 265 a wherein the sun gear 265 with the spur gear 265 b lying onthe downside is rotatably supported around a shaft 278 verticallystanding from the rear base 277.

The planet gear 2666 in the form of a spur gear engages with the spurgear 265 b of the sun gear 265.

Specifically, the planet gear 266 revolves by interlocking with the sungear 265 and moves on a planar portion 277 a forming a part of the rearbase 277, as shown by FIG. 28.

As will be also apparent from FIG. 28, the planar portion 277 a iseccentrically located with respect to a rotation center of the controlknob 261, 262.

In this way, a central space is assured behind the control device andthis space is available dispose various electric switches such as theairflow regulating 276.

In addition, it is also possible to assure a relatively large space todispose the wiring substrate 272 and therefore the wiring substrate 272can be provided with correspondingly much more number of electronicparts to improve the functionality of the wiring substrate 272.

The planar portion 277 a is provided with a projection 277 c with whichthe lower surface of the planet gear 266 moves in slidable contact andthereby a sliding resistance is alleviated.

According to the present embodiment, a gear case 279 fixed by screws tothe rear base 277.

Specifically, the gear case 279 is fixed along its periphery to the rearbase 277 by means of the screws 280 as will be seen in FIG. 5 andprovided at a central region with a screw 281 adapted to be entwistedinto the shaft 278 to prevent the sun gear 265 and the planet gear 266from dropping off.

An upper wall of the gear case 279 is provided with an inner rib 279 aadapted to come in contact with the sun gear 265 and a bottom wall isprovided with an inner rib 279 b adapted to come in contact with theplanet gear 266.

Said gear case 279 is further provided with an internal gear 282 adaptedto cooperate with the sun gear 265 to guide the movement of the planetgear 266.

As FIG. 32 illustrates in an enlarged scale, the gear case 279 isprovided with the circular arc-shaped internal gear 282 so that theplanet gear 266 is rotated and moved by the driving force from the sungear 265 between this internal gear 282 and the sun gear 265.

FIG. 32 is a rear view of the gear case 279.

Said gear case 279 includes along its periphery one or more tongue 283so that this or these tongue(s) may be fitted into the associatedpositioning groove(s) 277 b formed in the rear base 277 for positioningand then affixed to the rear base 277 by means of screws 280, 281.

Regarding the internal gear 282, instead of providing the internal gear282 in the gear case 279, it may be provided in the form of a circulararc-shaped gear on the rear base to guide the planet gear 266 asproperly as the internal gear 282 provided in the gear case 279.

Said planet gear 266 is provided with a projecting connector 266 a towhich the inner cable 284 a of the control cable 284 is connected.

As will be apparent from FIGS. 28 and 30, the projecting connector 266 aextends downward at an eccentric position with respect to the rotationcenter of the planet gear 266 through a square U-shaped groove 285formed in the planar portion 277 a of the rear base 277 to the rear sideof the planar portion 277 a.

FIG. 15 is a partial plan view showing an interlocking mechanism of thecontrol knob 131 and FIG. 16 is a plan view showing the sameinterlocking mechanism but with the gear case 149 removed to reveal theinner construction.

The square U-shaped groove 285 is provided in the form of a rectilinearslot having a length corresponding to a distance along which theprojecting connector 266 a can move as the control knob 131 is operatedin its maximum rotational range.

Specifically, the sun gear 265 as well as the planet gear 266 may beappropriately designed and the projecting connector 266 a may be locatedeccentrically with respect to the planet gear 266 to ensure that theprojecting connector 266 a moves substantially along a rectilinear pathas the planet gear 266 moves around the sun gear 265.

The square U-shaped groove 285 is provided at one end with an opening285 a so that the inner cable 284 a having one end connected to theprojecting connector 266 a may be drawn out through this opening 285 a.The outer cable 284 b containing therein the inner cable 284 a is heldby the cable holder (i.e., clamp member) 286 as seen in FIG. 27.

FIG. 30 is a partial plan view showing the interlocking mechanism of thecontrol knob 261 and FIG. 31 is a plan view showing the sameinterlocking mechanism with the gear case removed to reveal the innerconstruction.

According to this seventh embodiment, the projecting connector 266 a ofthe planet gear 266 is formed with the elongate pit 266 b, as seen inFIGS. 28, 29 and 31, containing the spring-loaded small ball 288(serving as the operational feel giving member). As will be seen inFIGS. 31 and 33, the bottom of the square U-shaped groove 285 with whichthe projecting connector 266 a comes in contact is formed with aplurality of operational feel giving depressions (operational feelgiving depressions) against which the small ball 288 is pressed underthe biasing effect of the spring 287.

As will be easily appreciated, these depressions are arranged at theintervals corresponding to the intervals of the symbols 263 a arrangedat the targets to which the control knob 261 is rotated.

FIG. 33 is a sectional view taken along a line D-D in FIG. 31.

In the case of the control device according to the seventh embodiment ashas been described above, the control knob 261 may be rotated until itsindicator 261 a is aligned with the desired symbol 263 a to assure thatthe sun gear 265 engaging with the interlocking gear 264 rotatingintegrally with the control knob 261 is rotated around the shaft 278.

In consequence, the planet gear 266 engaging with spur gear 265 b of thesun gear 265 is driven by the sun gear 265 and moved under the guidingby the sun gear 265 and the internal gear 282 while the planet gear 266rotates on its axis.

In this way, the projecting connector 266 a also moves in response torotation of the control knob 261 and, in the course of movement, theprojecting connector 266 a drops in one of the operational feel givingdepressions 289 corresponding to the rotational position (at which theindicator 261 a is aligned with the desired symbol 263 a) of the controlknob 261. At this moment, a slight rotation braking force (i.e.,operational feel) is exerted on the control knob 261.

In consequence, the inner cable 284 a of the control cable 284 isadvanced or retracted, causing the air conditioning unit to regulate thetemperature.

The control knob 262 is rotated with the projecting finger-grip heldwith the fingers until the indicator 262 a is aligned with the desiredsymbol 263 b.

The airflow regulating switch 276 is turned on and thereby the fan motorfor airflow regulation is controlled.

While the control knob 261, the control knob 262 and the interlockingmechanisms thereof have been described, it should be understood that theother control knob 291 is for wind direction regulation and theinterlocking mechanism associated with this control knob 291 has thesame construction as the interlocking mechanism associated with thecontrol knob 261.

Specifically, the control knob 291 may be rotated until the indicator291 a thereof is aligned with the desired symbol 292 a to ensure thatthe interlocking gear 293, the sun gear 294 and the planet gear 296 areinterlocked one with another. Thus, the projecting connector 295 a ofthe planet gear 295 moves and the inner cable 290 a of the control cable290 is advanced or retracted.

In this way, the wind direction is exchanged in the air conditioningunit.

The interlocking mechanism associated with the control knob 291 also isprovided with the operational feel giving mechanism comprising the smallball 288 and a plurality of the depression 289 as has been describedabove. In the course of rotating the control knob 291 so as to align theindicator with the respective symbols 292 a, the operator of the controlknob 291 experiences slight braking force (i.e., operational feel of thecontrol knob).

The control cable 296 includes the outer cable 296 b slidably containingtherein the inner cable 296 a.

Within the cylindrical control knob 291, there are disposed therespective push buttons 297, 298, 299 for the rear defroster switch, theair conditioning switch and the indoor air circulation/outdoor airintake switch.

When these push buttons 297, 298, 299 are depressed, sliders 300 a, 300b, 300 c shown in FIG. 29 are moved and thereby actuate push switches301 a, 301 b, 301 c mounted on the wiring substrate 272.

In FIG. 29, reference numerals 302, 303, 304 designate light guidingmembers, reference numeral 305 designates a lamp for night lighting,reference numeral 306 designates the display plate for the symbol 292 a,and reference numeral 307 designates the gear case.

The front bas 267 and the rear base 277 are fixed together by means ofscrews and a panel member 308 is fixed to the front surface of the frontbase 267.

As has previously been described, the stroke of the inner cable 284 a ofthe control cable 284 depends on the position to which the projectingconnector 266 a of the planet gear 264 has moved (i.e., operational feelgiving position) and therefore the stroke is free from affection due toa backlash between the interlocking gear 264 and the sun gear 265 or thesun gear 265 and the planet gear 266.

The inner cable 184 a is free from a stroke loss and hysteresisphenomenon and provides for air conditioning of high precision.

Even when the control knob is rotated over a wide range, such wide rangeof rotation is effectively reduced when transmitted to the planet gear266 and a moving range of the projecting connector is also reduced.

Consequently, the small ball 288 associated with the projectingconnector 266 a reliably cooperates with the respective depressions 289one by one and therefore it is not apprehended that the control knob 261might stop before the small ball 288 moves to the next depression.

FIG. 34 is a sectional view similar to FIG. 28, showing an eighthembodiment in the form of the control device for air conditioning unitof a motor vehicle.

This embodiment is similar to said seventh embodiment except that theoperational feel giving mechanism comprises the small ball 288 biased bythe spring within the elongate pit formed in the central region of theplanet gear 266 and the a plurality of depressions 289 formed on theinner surface of the gear case 279 against which said small ball 288 ispressed as shown by FIG. 35.

FIG. 35 is a rear view similar to FIG. 32, showing the gear case.

In the case of the control device according to this eighth embodiment,in response to rotational operation of the control knob 261, the planetgear 266 revolves around the sun gear 265 while the planet gear 266rotates around its own axis. In this course, the small ball 288 movesfrom the depress 289 to the depress 289, giving the operator of thecontrol knob 261 the operational feel of the control knob 261.

According to this embodiment, the stroke of the inner cable 284 a of thecontrol cable 284 corresponds to a movement distance of the projectingconnector 266 a depending on the movement of the planet gear 266.Therefore, the stroke is not affected by a backlash between the gears asin the case of the seventh embodiment.

FIG. 36 is a sectional view similar to FIG. 28, showing a ninthembodiment in the form of the control device for air conditioning unitof a motor vehicle.

The present embodiment is similar to said seventh embodiment except thatthe operational feel giving mechanism comprises the small ball 288biased by the spring 287 within an elongate pit 265 c formed in the sungear 265 and extending in the axial direction and a plurality ofoperational feel giving zones formed on the inner surface of the gearcase 279 as seen in FIG. 37.

FIG. 37 is a rear view similar to FIG. 32, showing the gear case.

In the case of the control device according to this ninth embodiment, inresponse to rotational operation of the control knob 261, the sun gear265 rotates and the small ball 288 moves along the respectivedepressions, causing the operator to experience operational feel of thecontrol knob 261.

With this embodiment, the stroke of the inner cable 289 a contained inthe control cable 284 is somewhat affect by a backlash between the sungear 265 and the planet gear 266 but a stroke loss due to such backlashis practically negligible.

FIG. 38 is a sectional view similar to FIG. 36, showing a variant of theninth embodiment in the form of the control device for air conditioningunit of a motor vehicle.

This variant is similar to said ninth embodiment except that the sungear 265 is formed with an elongate pit 265 d extending in radialdirection and the small ball 288 is disposed within this pit 265 dbiased by the spring 287. In association with this, as shown by FIG. 39,the gear case 279 is formed on its inner surface with the operationalfeel giving depresses 289 so as to cooperate with said spring-loadedsmall ball 288 and thereby to provide the operational feel givingmechanism.

While this variant will be affected by a backlash occurring between thesun gear 265 and the planet gear 266, a stroke loss due to such backlashis practically negligible.

FIG. 14 is a rear view similar to FIG. 7, showing the gear case.

FIG. 40 is sectional view similar to FIG. 36, showing the control devicefor air conditioning unit of a motor vehicle according to anothervariant of the ninth embodiment.

The variant is similar to said ninth embodiment except that theoperational feel giving mechanism comprises the small ball 288 biased bythe spring 287 within the recess 279 c formed in the gear case 279 and aplurality of depressions 289 formed on a periphery of the sun gear 265as shown in FIG. 41.

While this variant also is affected by a backlash between the sun gear265 and the planet gear 266, a stroke loss due to such backlash ispractically negligible.

FIG. 41 is a rear view similar to FIG. 32, showing the gear case.

The eight and the ninth embodiments as well as the variants areapplicable not only to the interlocking mechanism for the control knob261 but also to the interlocking mechanism for the control knob 291.

While the respective embodiments have been described above, the presentinvention should not be construed to be limited to the control devicefor air conditioning unit of a motor vehicle but to the other variouscontrol devices adapted to control operation of the external devices byrotationally operating the dial control devices.

1-15. (canceled)
 16. A dial control device comprising: a cylindricalcontrol knob; an interlocking gear in the form of a bevel gearintegrally mounted on said control knob; a sun gear having a bevel gearand another spur gear adapted to engage with said interlocking gear andserving for transmission of a driving force from said control knob; abase member rotatably supporting said control knob, said interlockinggear and said sun gear is provided with a planet gear adapted to move inassociation with said sun gear by rotating around its axis while turningaround said sun gear; said base member is provided with a gear casecovering therein a control cable associated with said planet gear andmoved as said planet gear turns, to operate an external device, coveringalso said sun gear, said planet gear and having an internal gear,circularly formed around said sun gear, to cooperate with said sun gearand guide said planet gear in a direction of its movement; said planetgear being arranged to be interlocked with each gear between said sungear and said internal gear; and one of said sun gear and said gear casebeing provided with operational feel giving portions, while the otherbeing provided with an operational feel giving member adapted to bepressed against said operational feel giving portions under a biasingeffect.
 17. The dial control device as recited by claim 16, wherein saidoperational feel giving member is formed of pellets urged by spring toprotrude from an elongated hole opened on said sun gear, while saidoperational feel giving portions are constructed of a plurality ofconcavities formed on an inner face of said gear case.
 18. The dialcontrol device as recited by claim 16, wherein said operational feelgiving member is formed of pellets arranged inside an elongated holeopened on said gear case and urged by a spring attached also inside saidelongated hole to protrude from said elongated hole toward inside saidgear case, while said operational feel giving portions are constructedof a plurality of concavities formed around said sun gear.
 19. The dialcontrol device as recited by claim 17 or 18, wherein said plurality ofconcavities constituting said operational feel giving portions arespaced from one another in accordance with a rotational position of thecontrol knob.